FEATURES TO IMPROVE AND SENSE TYMPANIC MEMBRANE APPOSITION BY TYMPANOSTOMY TUBE DELIVERY INSTRUMENT
A tympanostomy tube delivery device comprises a shaft assembly, a pressure equalization tube, and a sensor. The shaft assembly comprises a cannula and a pusher operable to translate relative to the cannula. The pressure equalization tube is positioned within the shaft assembly. The pusher is operable to drive the pressure equalization tube out of the shaft assembly. The sensor is operable to detect a physical parameter associated with engagement between the distal end of the shaft assembly and a tympanic membrane. A controller may activate a feedback device to inform an operator that the distal end of the shaft assembly has achieved suitable apposition with the tympanic membrane, based on information from the sensor.
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Some children may exhibit recurrent episodes of otitis media and/or -otitis media with effusion. Treatment of severe cases may involve the placement of a pressure equalization tube or tympanostomy tube through the tympanic membrane to provide adequate drainage of the middle ear by providing fluid communication between the middle and outer ear. In particular, such a tube may provide a vent path that promotes drainage of fluid from the middle ear via the Eustachian tube and may thus reduce stress imposed on the tympanic membrane from pressure within the middle ear. This may further reduce the likelihood of future infections and pressure induced ruptures of the tympanic membrane. Pressure equalization tubes may fall out spontaneously within about a year of placement. Exemplary pressure equalization tube delivery systems are disclosed in U.S. Pat. No. 8,052,693, entitled “System and Method for the Simultaneous Automated Bilateral Delivery of Pressure Equalization Tubes,” issued Nov. 8, 2011, the disclosure of which is incorporated by reference herein. Additional exemplary pressure equalization tube delivery systems are disclosed in U.S. Pat. No. 8,249,700, entitled “System and Method for the Simultaneous Bilateral Integrated Tympanic Drug Delivery and Guided Treatment of Target Tissues within the Ears,” issued Aug. 21, 2012, the disclosure of which is incorporated by reference herein. Still additional exemplary pressure equalization tube delivery systems are disclosed in U.S. Pub. No. 2011/0015645, entitled “Tympanic Membrane Pressure Equalization Tube Delivery System,” published Jan. 20, 2011, the disclosure of which is incorporated by reference herein.
Insertion of a pressure equalization tube may be performed using general anesthesia in some cases, which may require additional resources such as an operating room, the presence of an anesthesiologist, and time in a recovery room. Furthermore, the use of general anesthesia may include certain risks that a patient may or may not be comfortable with undertaking. Some pressure equalization tube delivery systems and methods provide a local anesthetic through iontophoresis. Examples of such systems and methods are disclosed in U.S. Pub. No. 2010/0198135, entitled “Systems and Methods for Anesthetizing Ear Tissue,” published Aug. 5, 2010, the disclosure of which is incorporated by reference herein. Additional examples of such systems and methods are disclosed in U.S. Pat. No. 8,192,420, entitled “Iontophoresis Methods,” issued Jun. 5, 2012, the disclosure of which is incorporated by reference herein.
While a variety of pressure equalization tube delivery systems and methods have been made and used, it is believed that no one prior to the inventor(s) has made or used an invention as described herein.
It is believed the present invention will be better understood from the following description of certain examples taken in conjunction with the accompanying drawings, in which like reference numerals identify the same elements and in which:
The drawings are not intended to be limiting in any way, and it is contemplated that various embodiments of the invention may be carried out in a variety of other ways, including those not necessarily depicted in the drawings. The accompanying drawings incorporated in and forming a part of the specification illustrate several aspects of the present invention, and together with the description serve to explain the principles of the invention; it being understood, however, that this invention is not limited to the precise arrangements shown.
DETAILED DESCRIPTIONThe following description of certain examples of the technology should not be used to limit its scope. Other examples, features, aspects, embodiments, and advantages of the technology will become apparent to those skilled in the art from the following description, which is by way of illustration, one of the best modes contemplated for carrying out the technology. As will be realized, the technology described herein is capable of other different and obvious aspects, all without departing from the technology. Accordingly, the drawings and descriptions should be regarded as illustrative in nature and not restrictive.
It is further understood that any one or more of the teachings, expressions, embodiments, examples, etc. described herein may be combined with any one or more of the other teachings, expressions, embodiments, examples, etc. that are described herein. The following-described teachings, expressions, embodiments, examples, etc. should therefore not be viewed in isolation relative to each other. Various suitable ways in which the teachings herein may be combined will be readily apparent to those of ordinary skill in the art in view of the teachings herein. Such modifications and variations are intended to be included within the scope of the claims.
I. Exemplary Pressure Equalization Tube Delivery Instrument
As noted above, a pressure equalization (PE) tube may be delivered to the tympanic membrane (TM) of a patient as a way of treating, for example, otitis media. In some instances, a delivery instrument may be used to insert PE tubes in the tympanic membrane (TM) without the use of general anesthesia.
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A cam follower (152) is fixedly secured to the proximal end of dilator tube (150). Cam follower (152) includes a laterally projecting pin (154) that is disposed in dilator track (132), such that rotation of camshaft (130) causes cam follower (152) and dilator tube (150) to translate. Similarly, a cam follower (162) is fixedly secured to the proximal end of shield tube (160). Cam follower (162) includes a laterally projecting pin (164) that is disposed in shield tube track (134), such that rotation of camshaft (130) causes cam follower (162) and shield tube (160) to translate. A cam follower (172) is fixedly secured to the proximal end of pusher tube (170). Cam follower (172) includes a laterally projecting pin (174) that is disposed in pusher tube track (136), such that rotation of camshaft (130) causes cam follower (172) and pusher tube (170) to translate. Finally, a cam follower (182) is fixedly secured to the proximal end of piercer (180). Cam follower (182) includes a laterally projecting pin (184) that is disposed in piercer track (138), such that rotation of camshaft (130) causes cam follower (182) and piercer (180) to translate. Stopper track (137) is simply annular in this example and includes a fixed elastomeric plug (135). An inwardly protruding boss (not shown) of housing (104) is disposed in stopper track (137). This boss remains disposed in stopper track (137) during rotation of camshaft (130).
As shown in
Camshaft (130) stops rotating when the inwardly protruding boss of housing (104) engages plug (135) in stopper track (137). The elastomeric nature of plug (135) provides a relatively soft stop, such that plug (135) acts as a damper. This may reduce jolting of PETDD (100) when camshaft (130) comes to a stop and/or may prevent camshaft (130) from making a popping or snapping sound when camshaft (130) comes to a stop. Upon completion of the above described sequence shown in
As noted above, PETDD (100) of the present example includes a trigger mechanism that is configured to selectively resist rotation of camshaft (130) by torsion spring (140). As best seen in
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When pushbutton (106) is laterally displaced relative to housing (104) (i.e., when a user depresses an exposed portion of pushbutton (106) laterally relative to housing (104)), bosses (107, 194) disengage such that pushbutton (106) no longer blocks pivoting of pawl member (190). Due to the torsional bias of camshaft (130), the ramped configuration of retention feature (131), and the chamfered lateral faces (199) of pawl ridge (198), camshaft (130) forces pawl member (190) to pivot out of the way to the position shown in
It should be understood that the foregoing components, features, and operabilities of PETDD (100) are merely illustrative examples. A PETDD (100) may include various other features in addition to or in lieu of those described above. By way of example only, any of the devices herein may also include one or more of the various features disclosed in any of the various references that are incorporated by reference herein. Some additional merely illustrative variations of PETDD (100) will be described in greater detail below, while other variations of PETDD (100) will be apparent to those of ordinary skill in the art in view of the teachings herein.
II. Exemplary Pressure Equalization Tube
III. Exemplary Pressure Equalization Tube Delivery Instrument Variations
Those of ordinary skill in the art will appreciate that the tympanic membrane (TM) may extend along a plane that is oblique to the direction of insertion of PETDD (100). In other words, the plane of the tympanic membrane (TM) may be obliquely angled relative to the longitudinal axis of cannula (120). By way of example only, the tympanic membrane (TM) may define an angle between approximately 79 degrees and approximately 54 degrees with the longitudinal axis of cannula (120). This oblique orientation of the tympanic membrane (TM) may pose difficulties with respect to some versions of a PETDD (100) that has a flat tip. For instance, inadequate apposition between the distal edge of tip member (122) and the tympanic membrane (TM) may lead to unsuccessful deployment of PE tube (200). This may prompt some operators of PETDD (100) to apply significant pressure against the tympanic membrane (TM), to deform the tympanic membrane (TM) into a position of substantial apposition with the flat-faced tip member (122) of PETDD (100). It may be desirable to maximize the apposition between the distal edge of tip member (122) and the tympanic membrane (TM), such as by enabling the distal edge of tip member (122) to complement the orientation of the tympanic membrane (TM) as much as possible, without requiring an operator to apply significant pressure against the tympanic membrane (TM) in order to achieve adequate apposition. The following examples include merely illustrative variations of PETDD (100) that may enhance apposition with the tympanic membrane (TM).
A. Exemplary PETDD with Tip Sleeve Having Complementary Bevel
Distal edge (302) of beveled tip member (300) is formed at an oblique angle in the present example. By way of example only, distal edge (302) may extend along a plane that defines an angle between approximately 79 degrees and approximately 54 degrees with the longitudinal axis of cannula (120). In other words, distal edge (302) may be oriented at an angle between about 11 degrees and about 36 degrees relative to the plane along which distal edge (303) of cannula (120) extends. Alternatively, any other suitable angles may be used. In the present example, the orientation of distal edge (302) may substantially complement the orientation of the tympanic membrane (TM). Accordingly, when beveled tip member (300) is positioned adjacent to the tympanic membrane (TM) as shown in
In an exemplary use, an operator may first anesthetize the patient's ear using an iontophoresis system as described in various references cited herein. Once the ear has been suitably anesthetized, the operator may remove pull-pin (108) from handpiece (102) by pulling distally on pull-pin (108) until pull-pin (108) is fully separated from housing (104). This will effectively unlock pushbutton (106) and enable operation of PETDD (100). The operator may then insert cannula (120) into a patient's ear canal. With the aid of a visualization system such as a scope, the operator may position distal edge (302) of beveled tip member (300) against the tympanic membrane (TM). This may require the operator to rotate PETDD (100) about the longitudinal axis of cannula (120) in order to orient distal edge (302) parallel with the tympanic membrane (TM). In some versions of PETDD (100), cannula (120) is rotatable relative to handpiece (102), such that the user may readily rotate cannula (120) about the longitudinal axis of cannula (120) while holding handpiece (120) stationary.
Once distal edge (302) has been oriented to be substantially parallel with the tympanic membrane (TM), and distal edge (302) is in apposition with the tympanic membrane (TM), the operator may press pushbutton (106) laterally to fire PETDD (100) and thereby deploy a PE tube (200) in the tympanic membrane (TM). It should be understood that the complementary orientations of distal edge (302) and the tympanic membrane (TM) may reduce the chances that PE tube (200) might fail to properly enter the dilated incision in the tympanic membrane (TM) during deployment. Once PE tube (200) is positioned within the tympanic membrane (TM), PETDD (100) may be retracted proximally and PE tube (200) may remain in the tympanic membrane (TM) in the rivet-like configuration shown in
B. Exemplary PETDD with Tip Having Opposing Bevel
In an exemplary use, an operator may first anesthetize the patient's ear using an iontophoresis system as described in various references cited herein. Once the ear has been suitably anesthetized, the operator may remove pull-pin (108) from handpiece (102) by pulling distally on pull-pin (108) until pull-pin (108) is fully separated from housing (104). This will effectively unlock pushbutton (106) and enable operation of PETDD (100). The operator may then insert cannula (400) into a patient's ear canal. With the aid of a visualization system such as a scope, the operator may position the distal-most portion (404) of distal edge (402) adjacent the tympanic membrane (TM). However, instead of placing distal edge (402) in apposition with the tympanic membrane (TM), PETDD (100) is oriented such that distal edge (402) forms a vertically opposing angle with the tympanic membrane (TM). In particular, distal edge (402) forms an angle with a vertical axis (VA) that is approximately the same as the angle formed between the tympanic membrane (TM) and the vertical axis (VA), with those angles being located on opposite sides of the vertical axis (VA). By way of example only, these angles may be between approximately 11 degrees and approximately 36 degrees. In some instances, the user may rotate PETDD (100) about the longitudinal axis of cannula (400) in order to achieve this positioning. In some versions of PETDD (100), cannula (400) is rotatable relative to handpiece (102), such that the user may readily rotate cannula (400) about the longitudinal axis of cannula (400) while holding handpiece (120) stationary.
Once PETDD (100) is oriented such that distal edge (402) forms a vertically opposing angle with the tympanic membrane (TM), the operator may press pushbutton (106) laterally to fire PETDD (100) and thereby deploy a PE tube (200) in the tympanic membrane (TM). It should be understood that the angularly opposing orientations of distal edge (402) and the tympanic membrane (TM) may promote PE tube (200) pivoting into the position shown in
C. Exemplary PETDD with Driven Apposition Enhancement Features
Controller (510) is in communication with a feedback device (512), a vacuum source (514), and a memory (516). Controller (510) is operable to selectively activate vacuum source (514) and/or feedback device (512) based on data from sensor (502) and memory (516) and/or in response to operator input. Controller (510) may comprise a microprocessor, ASIC, and/or various other components. Examples of components that may be incorporated into controller (510) will be described in greater detail below. In addition, other suitable components that may be incorporated into controller (510) will be apparent to those of ordinary skill in the art in view of the teachings herein. It should also be understood that one or more of the foregoing features may be omitted from PETDD (100) if desired. By way of example only, some other versions of PETDD (100) may lack sensor (502), feedback device (512), and memory (516). As another merely illustrative example, some other versions of PETDD (100) may lack vacuum source (514). Other suitable combinations and variations will be apparent to those of ordinary skill in the art in view of the teachings herein.
Vacuum source (514) is further coupled with cannula (120) and tip member (500), such that vacuum source (514) is operable to provide suction to tip member (500) based on instructions from controller (510). In some versions, this suction is used to assist in drawing the tympanic membrane (TM) against tip member (500), thereby promoting apposition between the tympanic membrane (TM) and tip member (500). In some uses of PETDD (100), an operator may wish to have vacuum source (514) deactivated during insertion of cannula (102) through the patient's ear canal; then activate vacuum source (514) via controller (510) after tip member (500) reaches the patient's tympanic membrane (TM). In drawing the tympanic membrane (TM) against tip member (500), the suction from vacuum source (514) may close any gaps that might otherwise remain from the operator's manual positioning of tip member (500).
In addition to or as an alternative to promoting apposition between tip member (500) and the tympanic membrane (TM), vacuum may be used to assist with sensing apposition between the tympanic membrane (TM) and tip member (500). For instance, sensor (502) may be operable to sense a physical parameter associated with fluid pressure in cannula (120) and tip member (500). With vacuum source (514) drawing suction as cannula (120) and tip member (500) are advanced toward the tympanic membrane (TM), the fluid pressure may remain substantially constant. However, as soon as tip member (500) achieves substantial apposition with the tympanic membrane (TM), the fluid pressure may suddenly and substantially drop. This pressure drop may be detected through sensor (502) and processed by controller (510). Various suitable forms that sensor (502) may take will be apparent to those of ordinary skill in the art in view of the teachings herein.
Controller (510) may monitor data from sensor (502) and compare it against one or more predetermined values stored in memory (516). When that data exceeds a threshold, falls below a threshold, or meets some other predetermined condition(s), controller (510) may trigger a predetermined response based on control logic/algorithms stored in memory (516). By way of example only, controller (510) may automatically deactivate vacuum source (514) in response to data from sensor (502). Such deactivation may occur upon the fluid pressure in cannula (120) dropping below a certain threshold. Alternatively, such deactivation may occur upon lapse of a certain time period following the fluid pressure of cannula (120) dropping below a certain threshold. As yet another merely illustrative example, controller (510) may automatically deactivate vacuum source (514) in response to deployment of PE tube (200). Of course, vacuum source (514) may simply be deactivated in response to user input directly from the operator of PETDD (100).
In some instances, controller (510) may activate feedback device (512) in response to data from sensor (502) exceeding a threshold, falling below a threshold, or satisfying some other predetermined condition(s). Feedback device (512) may provide any suitable perceivable feedback (e.g., audio, visual, and/or haptic feedback) to the operator of PETDD (100), to indicate to the operator that a significant event has occurred. For example, feedback device (512) may be used to inform the operator that the fluid pressure within cannula (120) has dropped below a threshold, thereby indicating to the operator that tip member (500) has achieved sufficient apposition with the tympanic membrane (TM). In addition or in the alternative, feedback device (512) may be used to inform the operator that PE tube (200) has been deployed. Other suitable events that may be alerted to the user through feedback device (512) will be apparent to those of ordinary skill in the art in view of the teachings herein. Similarly, various suitable forms that feedback device (512) may take will be apparent to those of ordinary skill in the art in view of the teachings herein.
In the example above, sensor (502) comprises a pressure sensor that is operable to detect fluid pressure within cannula (120). In addition or in the alternative, sensor (502) may be operable to detect strain in cannula (120) or tip member (500); and/or otherwise detect apposition between tip member (500) and the tympanic membrane (TM). By way of example only, sensor (502) may comprise a force sensor such as a strain gauge, inductive sensor, piezoelectric sensor and/or any other suitable type of sensor. Additional merely exemplary forms that sensor (502) may take are described in greater detail below. In the present example, sensor (502) is positioned near the distal end of tip member (500), such that sensor (502) may detect slight deformations that may occur in tip member (500) upon reaching sufficient apposition with the tympanic membrane (TM). It will be appreciated that sensor (502) may instead be positioned at any other suitable location along cannula (120). By way of example only, sensor (502) may be positioned at the interface of cannula (120) and tip member (500).
In versions where sensor (502) is operable to detect strain in cannula (120), controller (510) and feedback device (512) may be configured to provide the operator with real-time feedback associated with strain in cannula (120). This feedback may be interpreted by the user to indicate whether the operator should push harder distally on cannula (120). For instance, before tip member (500) reaches the tympanic membrane (TM), controller (510) may drive feedback device (512) to indicate to the operator that the operator needs to continue pushing distally on cannula (120). Once tip member (500) contacts the tympanic membrane (TM), sensor (502) may detect such contact; and controller (510) may responsively drive feedback device (512) to indicate to the operator that the operator has reached the tympanic membrane (TM). Feedback device (512) may further indicate to the operator that the operator needs to apply more or less force distally on cannula (120) in order to achieve proper apposition. Similarly, feedback device (512) may alert the operator when the distal force being applied to the tympanic membrane (TM) is excessive, thereby preventing potential damage to the tympanic membrane (TM). Other suitable ways in which sensor (502) and feedback device (512) may be used will be apparent to those of ordinary skill in the art in view of the teachings herein.
It should also be understood that two or more sensors (502) may be used in tip member (500), in cannula (120), and/or elsewhere. In versions with two or more sensors (502), such sensors (502) may detect the same kind of parameter (e.g., two sensors (502) detecting fluid pressure) and/or different parameters (e.g., one sensor (502) detecting fluid pressure and another sensor (502) detecting strain in tip member (500)). The control algorithms for controller (510) may be responsive to various permutations of data collected through a plurality of sensors (502). Various combinations of sensors (502) and types of control algorithms that may be based on data from two or more sensors (502) will be apparent to those of ordinary skill in the art in view of the teachings herein.
IV. Exemplary Apposition Sensing Features for Pressure Equalization Tube Delivery Instrument
As noted above, a combination of a controller (510) and sensor (502) may be used to determine whether a suitable degree of apposition has been achieved between tip member (122, 500) and a tympanic membrane (TM). Controller (510) may process data from sensor (502) to drive a feedback device (512) to enable the operator to evaluate whether a suitable degree of apposition has been achieved between tip member (122, 500) and a tympanic membrane (TM). Information from feedback (512) may serve as a supplement or substitute for tactile feedback provided to the operator through PETDD (100) itself. The examples below include various forms that sensor (502) and controller (510) may take, in addition to or as an alternative to the forms described above. It should therefore be understood that the teachings below may be readily combined with the teachings above in various permutations. For instance, while several examples described below include feedback device (512) but not vacuum source (514), a vacuum source (514) may of course be readily incorporated into the below examples if desired. Still other suitable combinations and variations will be apparent to those of ordinary skill in the art in view of the teachings herein.
A. Exemplary Apposition Sensing with Resistance through Annular Electrode
Controller (610) also includes an ohmmeter (620). Ohmmeter (620) is placed in line between electrode (652) and both ground pad (630) and ground (G); such that ohmmeter (620) is configured to detect resistance (if direct current is used) or impedance (if alternating current is used) between electrode (652) and ground pad (630). The resistance or impedance detected through ohmmeter (620) may vary based on the degree of contact between electrode (652) and the patient. For instance, when conductive electrode (652) is not contacting the patient at all, ohmmeter (620) may register an infinite level of resistance/impedance, indicating an open circuit. When electrode (652) comes into physical contact with the tympanic membrane (TM), the resistance/impedance between electrode (652) and ground pad (630) is substantially reduced. The reduction in resistance/impedance may drop in accordance with the degree to which electrode (652) (and, hence, tip member (650)) contacts the tympanic membrane (TM). For instance, when electrode (652) (and, hence, tip member (650)) only partially contacts the tympanic membrane (TM), the resistance/impedance registered by ohmmeter (620) may drop slightly; but when electrode (652) (and, hence, tip member (650)) fully contacts the tympanic membrane (TM), the resistance/impedance registered by ohmmeter (620) may drop significantly. The resistance/impedance value registered by ohmmeter (620) may thus be inversely proportional to the degree of apposition between electrode (652) (and, hence, tip member (650)) and the tympanic membrane (TM), with high resistance/impedance values being associated with low apposition percentages and low resistance/impedance values being associated with high apposition percentages.
In some instances, feedback device (512) provides a real-time numerical value associated with sensed resistance/impedance, and the operator may determine when sufficient apposition has been achieved based on their reading of feedback device (512). In addition or in the alternative, feedback device (512) may comprise a set of LEDs that illuminate red when electrode (652)/tip member (650) is not contacting the tympanic membrane (TM), that illuminate yellow when electrode (652)/tip member (650) initially contacts the tympanic membrane (TM) but without an adequate degree of apposition, and that illuminate green when electrode (652)/tip member (650) achieves adequate apposition with the tympanic membrane (TM). Other suitable forms that feedback device (512) may take to provide visual feedback will be apparent to those of ordinary skill in the art in view of the teachings herein.
As another merely illustrative example, feedback device (512) may provide audible feedback to the operator. For instance, feedback device (512) may emit a buzz or an audible tone as soon as electrode (652)/tip member (650) achieves adequate apposition with the tympanic membrane (TM). As yet another merely illustrative example, feedback device (512) may start emitting a pattern of tones or beeps as soon as electrode (652)/tip member (650) initially contacts the tympanic membrane (TM) but without an adequate degree of apposition, with the pattern of tones increasing in frequency and/or volume as the degree of apposition increases. Other suitable forms that feedback device (512) may take to provide audible feedback will be apparent to those of ordinary skill in the art in view of the teachings herein. In addition to or as an alternative to audible and/or visual feedback, feedback device (512) may provide tactile feedback such as vibrations, etc. In some instances, PETDD (100) may be operable to automatically insert PE tube (200) into the tympanic membrane (TM) upon detection of sufficient apposition. Regardless of the form of feedback, suitable levels of resistance/impedance that may be set to trigger feedback device (512) will be apparent to those of ordinary skill in the art in view of the teachings herein.
B. Exemplary Apposition Sensing with Resistance Through Discrete Electrodes
A controller (710) is in communication with electrodes (752a, 752b, 752c, 752d, 752e, 752f) and applies a voltage to each electrode (752a, 752b, 752c, 752d, 752e, 752f). By way of example only, wires, traces, and/or other feature(s) may couple controller (710) with electrodes (752a, 752b, 752c, 752d, 752e, 752f). Controller (710) is also in communication with electrical ground (G), a ground pad (630), and feedback device (512). Ground pad (630) comprises a conventional ground pad that may be applied to an exposed portion of the patient's skin. Ground pad (630) thus provides a ground return path with the patient when any electrode (752a, 752b, 752c, 752d, 752e, 752f) contacts the patient while in an activated state.
Controller (710) also includes a plurality of ohmmeters (720a, 720b, 720c, 720d, 720e, 7200. Each ohmmeter (720a, 720b, 720c, 720d, 720e, 7200 is placed in line between a corresponding electrode (752a, 752b, 752c, 752d, 752e, 7520 and both ground pad (630) and ground (G); such that each ohmmeter (720a, 720b, 720c, 720d, 720e, 7200 is configured to detect resistance (if direct current is used) or impedance (if alternating current is used) between a particular corresponding electrode (752a, 752b, 752c, 752d, 752e, 7520 and ground pad (630). The resistance or impedance detected through each ohmmeter (720a, 720b, 720c, 720d, 720e, 7200 may vary based on the degree of contact between the corresponding electrode (752a, 752b, 752c, 752d, 752e, 7520 and the patient. For instance, when a given electrode (752a, 752b, 752c, 752d, 752e, 7520 is not contacting the patient at all, the corresponding ohmmeter (720a, 720b, 720c, 720d, 720e, 720f) may register an infinite level of resistance/impedance, indicating an open circuit. When the same electrode (752a, 752b, 752c, 752d, 752e, 7520 comes into physical contact with the tympanic membrane (TM), the resistance/impedance between that electrode (752a, 752b, 752c, 752d, 752e, 752f) and ground pad (630) is substantially reduced.
Controller (710) may determine the degree of apposition based on the number of electrodes (752a, 752b, 752c, 752d, 752e, 752f) showing a substantial reduction in resistance/impedance, as measured through ohmmeters (720a, 720b, 720c, 720d, 720e, 720f). For instance, controller (710) may activate feedback device (512) based on the number of electrodes (752a, 752b, 752c, 752d, 752e, 752f) showing a substantial reduction in resistance/impedance. In some such versions, the triggering threshold may thus be the number of electrodes (752a, 752b, 752c, 752d, 752e, 752f) contacting the tympanic membrane (TM); rather than a particular resistance/impedance value alone serving as a triggering threshold. Of course, feedback device (512) in this context may be configured and operable in accordance with any of the teachings herein relating to feedback device (512).
A controller (810) is in communication with electrodes (852a, 852b, 852c, 852d, 852e, 8520 and applies a voltage to each pair of electrodes (852a, 852b, 852c, 852d, 852e, 8520. By way of example only, wires, traces, and/or other feature(s) may couple controller (810) with electrodes (852a, 852b, 852c, 852d, 852e, 8520. Controller (810) is also in communication with feedback device (512). Controller (810) also includes a plurality of ohmmeters (820a, 820b, 820c). Each ohmmeter (820a, 820b, 820c) is associated with a particular pair of electrodes (852a, 852b, 852c, 852d, 852e, 8520. In particular, ohmmeter (820a) is coupled with electrodes (852c, 8520, ohmmeter (820b) is coupled with electrodes (852a, 8520, and ohmmeter (820c) is coupled with electrodes (852b, 852e). Each ohmmeter (820, 820b, 820c) is configured to detect resistance (if direct current is used) or impedance (if alternating current is used) between the electrodes (852a, 852b, 852c, 852d, 852e, 8520 of the pair associated with ohmmeter (820a, 820b, 820c). Thus, ohmmeter (820a) is configured to detect resistance/impedance between electrodes (852c, 8520, ohmmeter (820b) is configured to detect resistance/impedance between electrodes (852a, 8520, and ohmmeter (820c) is configured to detect resistance/impedance between electrodes (852b, 852e). The resistance or impedance detected through each ohmmeter (820a, 820b, 820c) may vary based on the degree of contact between the corresponding electrodes (852a, 852b, 852c, 852d, 852e, 8520 and the patient. For instance, when a given electrode (852a, 852b, 852c, 852d, 852e, 8520 pair is not contacting the patient at all, the corresponding ohmmeter (820a, 820b, 820c) may register an infinite level of resistance/impedance, indicating an open circuit. When the same electrode (852a, 852b, 852c, 852d, 852e, 8520 pair comes into physical contact with the tympanic membrane (TM), the resistance/impedance between the electrodes (852a, 852b, 852c, 852d, 852e, 8520 of that pair is substantially reduced.
Controller (810) may determine the degree of apposition based on the number of electrode (852a, 852b, 852c, 852d, 852e, 8520 pairs showing a substantial reduction in resistance/impedance, as measured through ohmmeters (820a, 820b, 820c). For instance, controller (810) may activate feedback device (512) based on the number of electrode (852a, 852b, 852c, 852d, 852e, 8520 pairs showing a substantial reduction in resistance/impedance. In some such versions, the triggering threshold may thus be the number of electrode (852a, 852b, 852c, 852d, 852e, 8520 pairs contacting the tympanic membrane (TM); rather than a particular resistance/impedance value alone serving as a triggering threshold. Of course, feedback device (512) in this context may be configured and operable in accordance with any of the teachings herein relating to feedback device (512). It should also be understood that controller may monitor inductance of electrode (852a, 852b, 852c, 852d, 852e, 8520 pairs in addition to or in lieu of monitoring resistance/impedance.
C. Exemplary Apposition Sensing with Capacitance through Annular Electrode
A controller (910) is in communication with electrode (952) and applies a voltage to electrode (952). By way of example only, a wire, trace, and/or other feature(s) may couple controller (910) with electrode (952). Controller (910) is also in communication with a ground pad (630), and feedback device (512). Ground pad (630) comprises a conventional ground pad that may be applied to an exposed portion of the patient's skin. Ground pad (630) thus provides a ground return path with the patient when electrode (952) contacts the patient while in an activated state.
Controller (910) also includes a capacitance meter (920) and a capacitor (922). It should be understood that capacitor (922) is merely optional. Capacitance meter (920) is configured to detect the capacitance formed between electrode (952) and the tympanic membrane (TM). The capacitance detected through capacitance meter (920) may thus vary based on the degree of contact between electrode (952) and the patient. For instance, the capacitance formed between electrode (952) and the tympanic membrane (TM) may drop significantly as electrode (952) (and, hence, tip member (950)) comes into contact with the tympanic membrane (TM). In response to this drop in capacitance, controller (910) may activate feedback device (512) in accordance with any of the teachings herein relating to feedback device (512).
D. Exemplary Apposition Sensing with Light Pipes
In some versions, light conveyed through light pipes (1052) is externally visible along at least part of the length of light pipes (1052). For instance, a visible light may be seen through portion of light pipes (1052) extending through tip member (1050). In some such versions, the distal portions of light pipes (1052) are formed by channels within tip member (1050). In the present example, light pipes (1052) emit visible light through distal ends (1054). This visible light may be transmitted to the tympanic membrane (TM) as the operator inserts cannula (120) through the patient's ear canal. The light may appear as four dots on the tympanic membrane (TM). As tip member (1050) engages the tympanic membrane (TM), these projected dots may eventually darken. Thus, the operator may receive visual feedback indicating the degree of apposition between tip member (1050) and the tympanic membrane (TM), based on the degree to which light from light pipes (1052) has been darkened by contact with the tympanic membrane (TM). Other suitable ways in which light pipes (1052) may be incorporated into PETDD (100) will be apparent to those of ordinary skill in the art in view of the teachings herein.
E. Exemplary Apposition Sensing Through Enhanced Visualization
Imaging device (1200) may comprise any suitable type of scope, imaging fiber, etc. that is operable to capture and transmit images. Various suitable forms that imaging device (1200) may take will be apparent to those of ordinary skill in the art in view of the teachings herein. Imaging device (1200) is in communication with a display device (1202). Display device (1202) may comprise a video display screen, a set of wearable loupes, and/or any other suitable device. Various suitable forms that display device (1200) may take, as well as various suitable ways in which imaging device (1200) may be coupled with display device (1202), will be apparent to those of ordinary skill in the art in view of the teachings herein. Imaging device (1200) is positioned and operable to capture real-time video images of the tympanostomy site as cannula (120) is being inserted down the patient's ear canal. It should be understood that imaging device (1200) may even capture video images of the tympanostomy site when tip member (122) is in full apposition with the tympanic membrane (TM). Thus, with the combination of light projected from light fiber (1100) and video provided by imaging device (1200) and display device (1202), an operator may receive helpful real-time visual feedback indicating the positioning of tip member (122) and degree of apposition between tip member (122) and the tympanic membrane. Due to the positioning of imaging device (1200) in this example, this visual feedback may be more useful than visual feedback that might otherwise be provided through an imaging device that is positioned external to cannula (120).
V. Miscellaneous
It should be appreciated that any patent, publication, or other disclosure material, in whole or in part, that is said to be incorporated by reference herein is incorporated herein only to the extent that the incorporated material does not conflict with existing definitions, statements, or other disclosure material set forth in this disclosure. As such, and to the extent necessary, the disclosure as explicitly set forth herein supersedes any conflicting material incorporated herein by reference. Any material, or portion thereof, that is said to be incorporated by reference herein, but which conflicts with existing definitions, statements, or other disclosure material set forth herein will only be incorporated to the extent that no conflict arises between that incorporated material and the existing disclosure material.
Versions described above may be designed to be disposed of after a single use, or they can be designed to be used multiple times. Versions may, in either or both cases, be reconditioned for reuse after at least one use. Reconditioning may include any combination of the steps of disassembly of the device, followed by cleaning or replacement of particular pieces, and subsequent reassembly. In particular, some versions of the device may be disassembled, and any number of the particular pieces or parts of the device may be selectively replaced or removed in any combination. Upon cleaning and/or replacement of particular parts, some versions of the device may be reassembled for subsequent use either at a reconditioning facility, or by a user immediately prior to a procedure. Those skilled in the art will appreciate that reconditioning of a device may utilize a variety of techniques for disassembly, cleaning/replacement, and reassembly. Use of such techniques, and the resulting reconditioned device, are all within the scope of the present application.
By way of example only, versions described herein may be sterilized before and/or after a procedure. In one sterilization technique, the device is placed in a closed and sealed container, such as a plastic or TYVEK bag. The container and device may then be placed in a field of radiation that can penetrate the container, such as gamma radiation, x-rays, or high-energy electrons. The radiation may kill bacteria on the device and in the container. The sterilized device may then be stored in the sterile container for later use. A device may also be sterilized using any other technique known in the art, including but not limited to beta or gamma radiation, ethylene oxide, or steam.
Having shown and described various embodiments of the present invention, further adaptations of the methods and systems described herein may be accomplished by appropriate modifications by one of ordinary skill in the art without departing from the scope of the present invention. Several of such potential modifications have been mentioned, and others will be apparent to those skilled in the art. For instance, the examples, embodiments, geometrics, materials, dimensions, ratios, steps, and the like discussed above are illustrative and are not required. Accordingly, the scope of the present invention should be considered in terms of the following claims and is understood not to be limited to the details of structure and operation shown and described in the specification and drawings.
Claims
1. An apparatus comprising:
- (a) a shaft assembly having a distal end, wherein the shaft assembly comprises: (i) a cannula, and (ii) a pusher operable to translate relative to the cannula;
- (b) a pressure equalization tube positioned within the shaft assembly, wherein the pusher is operable to drive the pressure equalization tube out of the shaft assembly; and
- (c) a sensor, wherein the sensor is operable to detect a physical parameter associated with engagement between the distal end of the shaft assembly and a tympanic membrane.
2. The apparatus of claim 1, wherein the sensor is operable to detect a deformation in the shaft assembly.
3. The apparatus of claim 2, wherein the sensor comprises a strain gauge.
4. The apparatus of claim 1, wherein the sensor comprises a pressure sensor operable to sense fluid pressure.
5. The apparatus of claim 1, further comprising a controller in communication with the sensor, wherein the sensor comprises at least one exposed electrode positioned at the distal end of the shaft assembly.
6. The apparatus of claim 5, wherein the distal end of the shaft assembly has an annular distal face, wherein the at least one exposed electrode comprises an annular electrode extending along the annular distal face of the distal end of the shaft assembly.
7. The apparatus of claim 6, further comprising a ground pad, wherein the controller is operable to detect electrical resistance or impedance between the annular electrode and the ground pad.
8. The apparatus of claim 6, wherein the controller is operable to detect a capacitance associated with the annular electrode.
9. The apparatus of claim 5, wherein the distal end of the shaft assembly has an annular distal face, wherein the at least one exposed electrode comprises a plurality of discrete electrodes positioned at respective locations along the annular distal face of the distal end of the shaft assembly.
10. The apparatus of claim 9, further comprising a ground pad, wherein the controller is operable to detect electrical resistance or impedance between each of the discrete electrodes and the ground pad.
11. The apparatus of claim 9, wherein the discrete electrodes form pairs located in diametrically opposing positions along the annular distal face of the distal end of the shaft assembly, wherein the controller is operable to detect electrical resistance or impedance between the electrodes in each pair.
12. The apparatus of claim 1, further comprising a user feedback feature, wherein the user feedback feature is operable to alert an operator to one or more conditions associated with engagement between the distal end of the shaft assembly and a tympanic membrane based at least in part on information from the sensor.
13. The apparatus of claim 1, further comprising a vacuum source operable to draw a tympanic membrane against the distal end of the shaft assembly.
14. The apparatus of claim 13, wherein the pusher defines a lumen, wherein the vacuum source is operable to communicate suction through the lumen of the pusher.
15. The apparatus of claim 13, further comprising a controller, wherein the controller is in communication with the sensor, wherein the controller is in further communication with the vacuum source, wherein the controller is configured to deactivate the vacuum source based at least in part on information from the sensor indicating one or more conditions associated with engagement between the distal end of the shaft assembly and a tympanic membrane.
16. The apparatus of claim 1, wherein the distal end of the shaft assembly is beveled.
17. The apparatus of claim 1, further comprising an imaging device disposed within the shaft assembly.
18. An apparatus comprising:
- (a) a shaft assembly having a distal end, wherein the shaft assembly comprises: (i) a cannula, and (ii) a pusher operable to translate relative to the cannula;
- (b) a pressure equalization tube positioned within the shaft assembly, wherein the pusher is operable to drive the pressure equalization tube out of the shaft assembly;
- (c) a vacuum source coupled with the shaft assembly, wherein the vacuum source is operable to provide suction at the distal end of the shaft assembly; and
- (d) a sensor, wherein the sensor is operable to detect a physical parameter associated with a vacuum level the distal end of the shaft assembly.
19. An apparatus comprising:
- (a) a shaft assembly containing a tympanostomy tube, wherein the shaft assembly has a distal end, wherein the shaft assembly is operable to deliver the tympanostomy tube through the distal end and into a tympanic membrane of a patient; and
- (b) a light pipe configured to convey light toward the distal end of the shaft assembly, wherein the light pipe is configured to darken in response to contact between the distal end of the shaft assembly and a tympanic membrane of a patient.
20. The apparatus of claim 19, wherein the distal end of the shaft assembly has a distal edge, wherein the light pipe terminates in the distal edge of the shaft assembly.
Type: Application
Filed: Mar 14, 2013
Publication Date: Sep 18, 2014
Patent Grant number: 9320652
Applicant: Acclarent, Inc. (Menlo Park, CA)
Inventors: Bernard H. Andreas (Redwood City, CA), Rohit Girotra (Mountain View, CA), Jeffrey A. Walker (Livermore, CA), T. Daniel Gross (Los Gatos, CA), Matthew D. Clopp (Santa Clara, CA), Mahyar Z. Kermani (San Ramon, CA), Scott J. Baron (Menlo Park, CA)
Application Number: 13/804,553
International Classification: A61F 11/00 (20060101);